Numbers n such that the n-th Lucas number is prime, but cannot be written in the form a^2 + 7*b^2.

Terms

a(0) =2a(1) =8a(2) =11a(3) =13a(4) =31a(5) =41a(6) =47a(7) =61a(8) =79a(9) =313a(10) =617a(11) =863a(12) =1097a(13) =4793a(14) =5851a(15) =7741a(16) =12251a(17) =13963a(18) =35449a(19) =36779a(20) =44507a(21) =89849a(22) =140057a(23) =148091a(24) =202667a(25) =387433a(26) =443609a(27) =574219a(28) =631181a(29) =651821